Published by the University of Chicago Press for the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific vol:445 edition:1st pages:157-158
Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants. edition:2 location:Vienna date:16-20 August 2010
We present the methodology and some preliminary results of our study of the relationship between a Mira’s pulsating photosphere and its surrounding molecular layer(s) throughout several pulsation cycles, based on spatially resolved data. Our dataset consists of archival narrow-band observations in the near-infrared H and K bands obtained with the Palomar Testbed Interferometer between 1999 and 2006, extended with a few nights of VLTI AMBER low spectral resolution data and near-infrared SAAO photometry. The fitted model is the geometric star + layer model proposed by Perrin et al. (2004), in which the physical parameters (diameter and temperature of star and layer; wavelength dependent optical depth of the layer) are given a sinusoidal time dependence.